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a in (-oo:+oo)
(2/3)*a+3 = 3*a+73/15 // - 3*a+73/15
(2/3)*a-(3*a)-(73/15)+3 = 0
(2/3)*a-3*a-73/15+3 = 0
-7/3*a-28/15 = 0 // + 28/15
-7/3*a = 28/15 // : -7/3
a = 28/15/(-7/3)
a = -4/5
a = -4/5
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